invitation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of inviting.
• noun A spoken or written request for someone's presence or participation.
• noun An allurement, enticement, or attraction.

from The Century Dictionary.

• noun The act of inviting; solicitation to come, attend, or take part; an intimation of desire for the presence, company, or action of the person invited: as, an invitation to a wedding; an invitation to sing.
• noun The written or spoken form with which a person is invited.
• noun A drawing on by allurement or enticement; inducement; attraction; incitement.
• noun In the Anglican communion office, the brief exhortation beginning “Ye that (or who) do truly and earnestly repent you,” and introducing the confession.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of inviting; solicitation; the requesting of a person's company.
• noun A document written or printed, or spoken words, conveying the message by which one is invited.
• noun rare Allurement; enticement.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of inviting; solicitation; the requesting of a person's company; as, an invitation to a party, to a dinner, or to visit a friend.
• noun A document written or printed, or spoken words, conveying the message by which one is invited.
• noun Allurement; enticement.
• noun fencing A line that is intentionally left open to encourage the opponent to attack.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a request (spoken or written) to participate or be present or take part in something
• noun a tempting allurement